User Documentation

Data recorder
System manual
2696790000/02/04.2020
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Exceptions include the login and logoff of variables. These functions also
have an effect while a recording is ongoing, thereby enabling a dynamic con-
figuration of variables without interrupting value processes.
14.3 Reading out the buffer
You can read out the samples stored in the buffer of a profile at any time,
even during an ongoing recording. Each profile carries a write position on
which the next individual recording will be stored. This position can be
prompted.
Example
1 ... Write position
When using triggers, the positions at which a call has detected the occur-
rence of the corresponding trigger condition are delivered.
When using a start and stop trigger, the difference between the delivered
trigger positions is the number of the recorded samples minus 1, because
the stop position designates the position of the sample that was recorded
most recently.
The read functions enable the reading out of any buffer areas, whereby an
area is indicated by start position and sample number.
Example
1 ... Start position 2 ... Number
In order to enable step-by-step reading, a position is also delivered in addi-
tion to data, which can be used as a start position upon the next call.
In addition to the delivered read positions, reserved positions for the oldest
and newest samples are provided for first time reading.
Example
Start position: Oldest sample